CN210575340U - Repetitive pulse high-intensity magnetic field generating device - Google Patents
Repetitive pulse high-intensity magnetic field generating device Download PDFInfo
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- CN210575340U CN210575340U CN201921855431.0U CN201921855431U CN210575340U CN 210575340 U CN210575340 U CN 210575340U CN 201921855431 U CN201921855431 U CN 201921855431U CN 210575340 U CN210575340 U CN 210575340U
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Abstract
The utility model provides a repetitive pulse high-intensity magnetic field produces device belongs to the high-intensity magnetic field. The device comprises a magnet coil and a plurality of independent power supply units, wherein the independent power supply units are connected to two ends of the magnet coil in parallel; each power supply unit comprises an energy supply element, a follow current loop and an electric switch, wherein the follow current loop is connected with the energy supply element in parallel and then connected with the electric switch in series; the follow current loop comprises a follow current resistor and a one-way conduction element which are connected in series. The utility model discloses a scheme is discharged to single magnet to many sets of power, through the connected mode and the electrical switch discharge time sequence of controlling a plurality of electrical unit and magnet coil alright produce the high-intensity magnetic field of repetitive pulse, have that circuit topology and control system are simple, the magnetic field waveform is diversified, magnetic field polarity, magnetic field intensity and repetition frequency are controllable advantage wantonly.
Description
Technical Field
The utility model belongs to the technical field of high-intensity magnetic field, more specifically relates to a repetitive pulse high-intensity magnetic field produces device.
Background
Strong magnetic fields are used in modern scientific research to provide extremely important experimental conditions. The high magnetic field is generally provided by a permanent magnet or superconducting magnet system internationally, however, the permanent magnet system must adopt a mechanical motion mode to realize the magnetic field alternation of a magnetic refrigeration material, and the superconducting magnet system has the problems of low-temperature operation condition, quench limitation, high manufacturing cost and the like.
The pulse magnetic field is a magnetic field generated in a space by pulse current passing through a magnet coil, the direction of the current passing through the coil determines the polarity of the waveform of the magnetic field, and the pulse current is intermittently and repeatedly passed through the magnet coil to generate a repetitive pulse magnetic field. Compared with a permanent magnet or a superconducting magnet, the repeated pulse magnetic field system can control the existence of a magnetic field in a power-on mode, has the advantages of avoiding the mechanical reciprocating motion of the permanent magnet, and meanwhile, has lower manufacturing cost and higher achievable field intensity compared with the superconducting magnet system, and obtains extensive research. Wherein the magnetic field intensity, the magnetic field stability and the magnetic field waveform repetition frequency are key experimental parameters.
The current repetitive pulse electromagnetic system generally designs a power supply topology to control a large current waveform under a high voltage to generate a repetitive pulse magnetic field waveform. For example, the Wuhan national pulse laboratory uses an alternating current capacitor as a power supply, and controls a bidirectional anti-parallel thyristor to realize a repetitive pulse high-intensity magnetic field with positive and negative polarities in single discharge and 3T of magnetic field intensity. The system achieves the maximum energy utilization rate theoretically, but is limited by the power of a charger, the field intensity is not high, the waveform repetition frequency of a magnetic field is limited by the charging time of the power supply, and the polarity of the magnetic field can only be generated by positive and negative alternation. For another example, aiming at the repetitive pulse high-intensity magnetic field waveform required in scientific experiments such as neutron diffraction, magnetization and the like, the national laboratory of America takes a pulse generator as a power supply, provides two paths of current inputs, and is matched with the power supply input by taking a bidirectional antiparallel thyristor as a control switch, so that the bipolar repetitive pulse high-intensity magnetic field of 2Hz is realized. However, the system has complex equipment control, a plurality of system components and is not suitable for a large-inductance magnet due to the existence of energy-feeding inductance in the circuit.
Generally, the repetitive pulse high-intensity magnetic field device in the world currently has the following defects: (1) the power supply topology or the control system is complex, and the construction cost is high; (2) the application range of the magnet inductance in the electromagnetic device is limited by the energy-feeding inductance, and the generated magnetic field intensity is relatively low; (3) a set of power supply is adopted, the magnetic field intensity is limited by the power of the power supply, and the repetition frequency is limited by the charging time of the power supply; (4) the waveform of the repeated pulse magnetic field is single.
Disclosure of Invention
The defect to current scheme, the utility model provides a high-intensity magnetic field of repetitive pulse produces device adopts many sets of power to realize the repetitive pulse magnetic field to the scheme that single magnet discharged, and its purpose is complicated with control system in solving current system topology, electromagnetic means magnet inductance application scope receives to be presented can the inductance restriction, magnetic field intensity by the power supply power restriction, repetition frequency is by the restriction of power charging time and the single technical problem of repetitive pulse waveform.
The utility model provides a repetitive pulse high-intensity magnetic field generating device, which comprises a magnet coil and a plurality of independent power supply units, wherein the independent power supply units are all connected in parallel at two ends of the magnet coil;
each power supply unit comprises an energy supply element, a follow current loop and an electric switch, wherein the follow current loop is connected with the energy supply element in parallel and then connected with the electric switch in series; the follow current loop comprises a follow current resistor and a one-way conduction element which are connected in series.
Further, the energy supply element is a capacitor, the unidirectional conducting element is a diode, and the electrical switch is a controllable thyristor.
Further, the energy supply element is charged to a preset voltage, and the preset voltage is determined according to the magnetic field intensity required by the waveform.
Further, the positive and negative poles of the plurality of power supply units are connected to the terminals of the magnet coil according to the polarity of the preset magnetic field waveform.
Further, the electrical switch is controlled according to a preset discharge timing, which is determined according to the required magnetic field frequency.
The utility model discloses compare and have many-sided beneficial effect in prior art:
(1) the utility model has the advantages that through the arrangement of the plurality of independent power supply units, on one hand, the process of supplementing power supply energy in the discharging process can be avoided, so that the waveform frequency of the magnetic field is not limited by the charging time, and the magnetic field intensity is not limited by the power of the charger; on the other hand, the polarity, the magnetic field intensity and the repetition frequency of the magnetic field waveform are controllable arbitrarily, and the magnetic field waveform is diversified;
(2) each power supply unit has the same composition, simple and reliable structure and no need of a complex control system;
(3) the power supply unit does not need to use energy feedback inductor, so the application range of the magnet inductor is not limited by the energy feedback inductor, and higher magnetic field intensity can be generated.
Drawings
FIG. 1 is a schematic circuit diagram of a repetitive pulse high-intensity magnetic field generating device.
FIG. 2 is a single polarity repetitive pulse high magnetic field simulation waveform.
FIGS. 3(a) and (b) show the waveforms of the single-polarity stepped repetitive pulse high-intensity magnetic field simulation.
FIG. 4 is a bipolar repetitive pulse high-intensity magnetic field simulation waveform.
Fig. 5(a) and (b) show bipolar stepped repetitive pulse high-intensity magnetic field simulation waveforms.
FIGS. 6(a) and (b) are multi-pattern repetitive pulse high-intensity magnetic field simulation waveforms.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Fig. 1 shows a repetitive pulse high-intensity magnetic field generating device provided by an embodiment of the present invention, and for convenience of description, only the parts related to the embodiment of the present invention are shown.
A repetitive pulse high-intensity magnetic field generator comprises a magnet coil and multiple independent power supply units CM1、……CMNL, R are the inductance and the internal resistance of the magnet coil, respectively, the plurality of independent power supply units are all connected in parallel at two ends of the magnet coil;
wherein the basic composition of each power supply unit is the same, with the first power supply unit CM1For example, comprises a power supply element C1Freewheel circuit and electrical switch S1Said free-wheeling circuit and said energizing element C1Connected in parallel and then connected with the electrical switch S1Are connected in series; the follow current loop comprises follow current resistors R connected in seriesd1And a one-way conduction element D1。
Preferably, the energizing element C1Is a capacitor, a one-way conduction element D1Is a diode, an electrical switch S1Is a controllable thyristor.
In the prior art, because the power supply part of the repetitive pulse electromagnetic system only comprises a single energy supply element, for example, only one capacitor is arranged, and after the capacitor is discharged, the capacitor needs to be charged again immediately to perform next discharging. The utility model discloses a set up a plurality of independent power supply units, fully charge all condensers before discharging, can avoid the process of supplementing the power energy in the discharge process on the one hand to magnetic field waveform frequency is not restricted by the charge time, and magnetic field intensity is not restricted by the charger power; on the other hand, the polarity, the magnetic field strength and the repetition frequency of the magnetic field waveform are arbitrarily controllable, and the magnetic field waveform is diversified. Moreover, each power supply unit has the same composition and is formed by combining conventional pulse power supplies, a power supply system does not need to be specially designed, the structure is simple and reliable, and a complex control system is not needed; further, no energy-feedback inductor is used in the power supply unit, so the applicable range of the magnet inductor is not limited by the energy-feedback inductor.
In an embodiment of the present invention, a magnetic field generating method based on the above repetitive pulse high-intensity magnetic field generating device includes the following steps:
(1) the magnet coils were immersed in liquid nitrogen to cool to 77K and the cooling process of the magnets was monitored by measuring the change in resistance of the magnets.
(2) And connecting the positive and negative poles of the plurality of power supply units with the terminal of the magnet coil according to the polarity of a preset magnetic field waveform, and charging the capacitor in each power supply unit to a set voltage.
The polarity of the magnetic field waveform depends on the power supply direction of the energy supply element, and when the positive and negative poles of the capacitor module are reversed or the power supply and the terminal ends of the magnet coil are reversed, the polarity of the waveform is changed accordingly. Further, the magnetic field intensity depends on the magnitude of the set voltage, and the magnetic field frequency is controlled by the discharge timing.
The embodiment of the utility model provides an in, according to repetitive pulse's frequency, magnetic field intensity and magnetic field waveform polarity, combine the configuration and the magnet coil parameter of current condenser module, use matlab's simulink module simulation to confirm the charging voltage and the time-to-trigger of condenser among each power supply unit.
(3) And controlling the electrical switch to sequentially discharge the magnet coil according to a preset discharge time sequence.
If the connection directions of the power supply units and the terminals of the magnet coil are consistent, a single-polarity repetitive pulse high-intensity magnetic field waveform as shown in FIG. 2 is generated; on the basis, the preset voltage of each power supply module is adjusted, so that a unipolar step type pulse high-intensity magnetic field waveform as shown in fig. 3 is generated.
If the connection mode of the power supply units and the magnet coil terminals is in alternate direction connection (namely, positive connection-negative connection- … …), a bipolar high-frequency repetitive pulse high-intensity magnetic field waveform as shown in fig. 4 is generated, and on the basis of the bipolar high-frequency repetitive pulse high-intensity magnetic field waveform, the preset voltage of each power supply module is adjusted, so that a bipolar step type pulse high-intensity magnetic field waveform as shown in fig. 5 is generated.
If the connection direction of the plurality of power supply units and the terminal of the magnet coil is arbitrary and the discharge time is controlled as required, a variety of repetitive pulse high-intensity magnetic field waveforms of arbitrary polarity and frequency can be generated, which is exemplified by the waveform of the repetitive pulse high-intensity magnetic field of fig. 6.
And (3) adjusting: after each discharge, the resistance value change of the magnet coil caused by heat generation is monitored, and the set voltage of each power supply is adjusted accordingly.
Considering that the resistance of the magnet coil changes due to the heating of the magnet, in order to avoid the influence of the resistance change on the pulse current and the magnetic field intensity, the resistance value change of the magnet coil after each discharge due to the heating is monitored, then the set voltage of each power supply is adjusted, and the preset repetitive pulse high-intensity magnetic field waveform can be realized more accurately.
The utility model discloses an in the embodiment, a plurality of power supply unit that are parallelly connected at magnet coil both ends are connected according to the wiring end of predetermined magnetic field waveform polarity with magnet coil, then discharge according to discharge time sequence control electrical switch, alright produce the strong magnetic field of repetitive pulse of waveform strength, polarity, the arbitrary transform of frequency. The utility model provides a device is produced to intense magnetic field of repetitive pulse has that power topology is simple reliable, electromagnetic system control is simple, magnetic field waveform intensity, polarity and frequency are controllable wantonly, magnetic field frequency does not receive characteristics such as power charging time restriction, realization magnetic field intensity do not receive charging power restriction.
It will be understood by those skilled in the art that the foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A repetitive pulse strong magnetic field generating device is characterized by comprising a magnet coil and a plurality of independent power supply units, wherein the independent power supply units are connected in parallel at two ends of the magnet coil;
each power supply unit comprises an energy supply element, a follow current loop and an electric switch, wherein the follow current loop is connected with the energy supply element in parallel and then connected with the electric switch in series; the follow current loop comprises a follow current resistor and a one-way conduction element which are connected in series.
2. The repetitive pulse high intensity magnetic field generating device of claim 1, wherein said energizing element is a capacitor.
3. The repetitive pulse high intensity magnetic field generating device of claim 1, wherein said one-way conductive element is a diode.
4. The repetitive pulsed high intensity magnetic field generating device of claim 1, wherein said electrical switch is a controllable thyristor.
5. The repetitive pulse high intensity magnetic field generating device as defined in any one of claims 1 to 4, wherein the energizing element is charged to a predetermined voltage determined in accordance with the intensity of the magnetic field required for the waveform.
6. The repetitive pulse high intensity magnetic field generating device according to any one of claims 1 to 4, wherein the positive and negative poles of the plurality of power supply units are connected to the terminals of the magnet coil in accordance with the polarity of a predetermined magnetic field waveform.
7. The repetitive pulsed intense magnetic field generating device according to any one of claims 1-4, wherein the electrical switch is controlled according to a preset discharge timing which is determined according to the desired magnetic field frequency.
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| CN201921855431.0U CN210575340U (en) | 2019-10-31 | 2019-10-31 | Repetitive pulse high-intensity magnetic field generating device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113852216A (en) * | 2021-10-21 | 2021-12-28 | 中国工程物理研究院应用电子学研究所 | High-efficiency repetition frequency pulse magnetic field system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113852216A (en) * | 2021-10-21 | 2021-12-28 | 中国工程物理研究院应用电子学研究所 | High-efficiency repetition frequency pulse magnetic field system |
| CN113852216B (en) * | 2021-10-21 | 2023-06-16 | 中国工程物理研究院应用电子学研究所 | High-efficiency repetition frequency pulse magnetic field system |
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